Add tests

Author: gspencergoog

lib/ui/compositing/scene.cc

@@ -44,7 +44,7 @@ Scene::Scene(std::shared_ptr<flutter::Layer> rootLayer,
              bool checkerboardOffscreenLayers) {
   auto viewport_metrics = UIDartState::Current()
                               ->platform_configuration()
-                              ->get_window()
+                              ->window()
                               .viewport_metrics();
 
   layer_tree_ = std::make_unique<LayerTree>(

lib/ui/painting/canvas.cc

@@ -428,7 +428,7 @@ void Canvas::drawShadow(const CanvasPath* path,
   }
   SkScalar dpr = UIDartState::Current()
                      ->platform_configuration()
-                     ->get_window()
+                     ->window()
                      .viewport_metrics()
                      .device_pixel_ratio;
   external_allocation_size_ += path->path().approximateBytesUsed();

lib/ui/window/platform_configuration.h

@@ -100,7 +100,7 @@ class PlatformConfiguration final {
   /// @brief Retrieves the Window.
   ///
   /// @return the Window.
-  const Window& get_window() const { return *window_; }
+  const Window& window() const { return *window_; }
 
   //----------------------------------------------------------------------------
   /// @brief Sets the viewport metrics of the Window.

lib/ui/window/platform_configuration_unittests.cc

@@ -51,6 +51,21 @@ class DummyPlatformConfigurationClient : public PlatformConfigurationClient {
 TEST(PlatformConfigurationTest, PlatformConfigurationInitialization) {
   DummyPlatformConfigurationClient client;
   PlatformConfiguration configuration(&client);
+
+  ASSERT_EQ(configuration.client(), &client);
+  ASSERT_EQ(configuration.window().viewport_metrics().device_pixel_ratio, 1.0);
+  ASSERT_EQ(configuration.window().viewport_metrics().physical_width, 0.0);
+  ASSERT_EQ(configuration.window().viewport_metrics().physical_height, 0.0);
+}
+
+TEST(PlatformConfigurationTest, PlatformConfigurationWindowMetricsUpdate) {
+  DummyPlatformConfigurationClient client;
+  PlatformConfiguration configuration(&client);
+
+  configuration.SetWindowMetrics({2.0, 10.0, 20.0});
+  ASSERT_EQ(configuration.window().viewport_metrics().device_pixel_ratio, 2.0);
+  ASSERT_EQ(configuration.window().viewport_metrics().physical_width, 10.0);
+  ASSERT_EQ(configuration.window().viewport_metrics().physical_height, 20.0);
 }
 
 }  // namespace testing